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LTM2881CY-3-PBF Datasheet(PDF) 8 Page - Linear Technology |
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LTM2881CY-3-PBF Datasheet(HTML) 8 Page - Linear Technology |
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8 / 22 page  LTM2881 2881fa LOGIC SIDE (VCC, VL, GND) DOUT (Pin A1): General Purpose Logic Output. Logic output connected through isolation path to DIN. Under the condition of an isolation communication failure DOUT is in a high impedance state. TE (Pin A2): Terminator Enable. A logic high enables a termination resistor (typically 120Ω) between pins A and B. DI (Pin A3): Driver Input. If the driver outputs are enabled (DE high), then a low on DI forces the driver noninverting output (Y) low and the inverting output (Z) high. A high on DI, with the driver outputs enabled, forces the driver noninverting output (Y) high and inverting output (Z) low. DE (Pin A4): Driver Enable. A logic low disables the driver leaving the outputs Y and Z in a high impedance state. A logic high enables the driver. RE (Pin A5): Receiver Enable. A logic low enables the receiver output. A logic high disables RO to a high imped- ance state. RO (Pin A6): Receiver Output. If the receiver output is enabled (RE low) and if A – B is > 200mV, RO is a logic high, if A – B is < 200mV RO is a logic low. If the receiver inputs are open, shorted, or terminated without a valid signal, RO will be high. Under the condition of an isolation communication failure RO is in a high impedance state. VL (Pin A7): Logic Supply. Interface supply voltage for pins RO, RE, TE, DI, DE, DOUT, and ON. Recommended operating voltage is 1.62V to 5.5V. Internally bypassed to GND with 2.2µF. ON (Pin A8): Enable. Enables power and data communica- tion through the isolation barrier. If ON is high the part is enabled and power and communications are functional to the isolated side. If ON is low the logic side is held in reset and the isolated side is unpowered. GND (Pins B1-B5): Circuit Ground. VCC(PinsB6-B8):SupplyVoltage.Recommendedoperat- ing voltage is 3V to 3.6V for LTM2881-3 and 4.5V to 5.5V for LTM2881-5. Internally bypassed to GND with 2.2µF. pin FuncTions ISOLATED SIDE (VCC2, GND2) DIN (Pin L1): General Purpose Isolated Logic Input. Logic input on the isolated side relative to VCC2 and GND2. A logic high on DIN will generate a logic high on DOUT. A logic low on DIN will generate a logic low on DOUT. SLO (Pin L2): Driver Slew Rate Control. A low input, rela- tive to GND2, will force the driver into a reduced slew rate mode for reduced EMI. A high input, relative to GND2, puts the driver into full speed mode to support maximum data rates. Y (Pin L3): Non Inverting Driver Output. High impedance when the driver is disabled. Z (Pin L4): Inverting Driver Output. High impedance when the driver is disabled. B (Pin L5): Inverting Receiver Input. Impedance is > 96kΩ in receive mode with TE low or unpowered. A (Pin L6): Non Inverting Receiver Input. Impedance is > 96kΩ in receive mode with TE low or unpowered. VCC2 (Pins L7-L8): Isolated Supply Voltage. Internally generated from VCC by an isolated DC/DC converter and regulated to 5V. Internally bypassed to GND2 with 2.2µF. GND2 (Pins K1-K8): Isolated Side Circuit Ground. The pads should be connected to the isolated ground and/or cable shield. |
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